how to figure out calories I burn?

cradice
cradice Posts: 3
edited September 23 in Fitness and Exercise
If I am doing an hour of crossfit 3 times a week then how do I compute the number of calories I am burning per exercise? Especially since each workout is different. I could really use some help on this. I am also doing Yoga twice a week and can't figure out the calorie burn off for that either. Please help?
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